이런 메시지를 해결하려면

메일 서버를 구축한 후 메일을 보내면 다음과 같은 메시지가 돌아옵니다.

잘 되던 메일 서버가 왜 이러는 건지????

    **********************************************
    **      THIS IS A WARNING MESSAGE ONLY      **
    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
    **********************************************

The original message was received at Sat, 23 Mar 2002 02:08:23 +0900
from [218.51.123.110]

   ----- The following addresses had transient non-fatal errors -----
<inzo@inzo.net>

   ----- Transcript of session follows -----
451 <design@inzo.net>... inzo.net: Name server timeout
451 <design@inzo.net>... inzo.net: Name server timeout
451 <inzo@inzo.net>... inzo.net: Name server timeout
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old
451 <design@inzo.net>... inzo.net: Name server timeout